Update README

The versions for gem dependencies added.
Updated gem versions

Added specific gem versions compatible with ruby 1.8.7.
Update map.rb

Rectified SQLite3 exception.
Update map_controller.rb

Rectified for SQLite3 exception.
Merge pull request #170 from anishshah101/master

Gem dependency versions added
mobile width meta tag
Merge branch 'master' of github.com:jywarren/mapknitter